The eruption of the Alaskan Aniakchak volcano of 3.6 thousand years ago was one of the largest Holocene eruptions worldwide. The resulting ash is found in several Alaskan sites and as far as Newfoundland and Greenland. This dataset describes ash from the Aniakchak eruption in a marine sediment core from the western Chukchi Sea in the Arctic Ocean. Combined with radiocarbon dates on mollusks, the volcanic age marker is used to calculate the marine radiocarbon reservoir age at that time.

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The data come from one marine sediment core, Core SWERUS-L2-2-PC1 from 72.52° N 175.32° W in the Chukchi Sea, northeast of Wrangel Island. The dataset was originally published in the Supplement to Pearce et al. 2017 at http://www.clim-past.net/13/303/2017/cp-13-303-2017-supplement.zip. A copy is stored in the Bolin Centre Database.